在app.component.ts中判断是否在某个页面，从而执行不同操作：
import {ViewChild} from '@angular/core';
import {HomePage} from '../pages/home/home';
.
.
@ViewChild(Nav) nav: Nav;
let activeVC = this.nav.getActive();
let page = activeVC.instance;
//this.navCtrl.getActive().name == 'HomePage' 也可以
if (page instanceof HomePage) {
}
然后，如果这种判断情况出现过多，我想在provider中封装个方法呢：
import {App } from 'ionic-angular';
constructor(private app: App){}
/**
* 是否在某个页面
* @param page like->import {HomePage} from '../pages/home/home';
* @return {boolean}
*/
inPageing(page): boolean {
//注意：(getActiveNav) is deprecated and will be removed in the next major release. Use getActiveNavs instead.
let activeVC = this.app.getActiveNavs()[0].getActive();
let newPage = activeVC.instance;
if (newPage instanceof page) {//当前页面对讲是否是页面
return true;
}else{
return false;
}
}
``